Hand-held band saw

ABSTRACT

A hand-held band saw includes a band saw body and an supporting device. The supporting device includes a fixing member, a slider, a supporting member, and a connection assembly. The fixing member is fixedly connected to the band saw body, the slider is slidably connected to the fixing member, the supporting member supports a workpiece and is connected to the slider, and the connection assembly connectes the slider and the supporting member. When the slider moves, the connection assembly is capable of enabling the supporting member to move along with the slider. The connection assembly comprises a buffer member mounted between the slider and the supporting member.

RELATED APPLICATION INFORMATION

This application is a continuation of International Application NumberPCT/CN2020/125275, filed on Oct. 30, 2020, through which thisapplication also claims the benefit under 35 U.S.C. § 119(a) of ChinesePatent Application No. 201911042736.4, filed on Oct. 30, 2019, ChinesePatent Application No. 201911042739.8, filed on Oct. 30, 2019, ChinesePatent Application No. 201911042715.2, filed on Oct. 30, 2019, andChinese Patent Application No. 201911042738.3, filed on Oct. 30, 2019,all of which are incorporated herein by reference in their entirety.

BACKGROUND

At present, the hand-held band saw is widely used, and can be used tocut all machinable metals including the stainless steel, pipes, solidbodies and the like. The hand-held band saw has a strong thermalresistance, wear resistance and vibration resistance, and has a longerservice life compared with similar products. Because of its flexible andconvenient use, the hand-held band saw has been widely used in scenariosof cutting various types of bars, pipes and profiles in industry andhome.

To facilitate cutting, a supporting member for supporting the workpieceis disposed on a cutting side edge of the workpiece cut by the sawblade. When cutting, the user can support the cut workpiece by adjustingthe height of the supporting member, but the supporting memberconfigured on the band saw products on the market needs an external toolwhen adjusting the height, which is insufficient in convenience andexperience of use.

On the other hand, during the running process of the tool, thesupporting member falls or collides with the object rigidly, resultingin the stress collapse, enabling the supporting member to return to anoriginal position, or directly leading to the damage of the supportingmember, thereby affecting the working efficiency.

SUMMARY

A hand-held band saw includes: a housing assembly, a first rotationwheel, a second rotation wheel, a motor. The housing assembly includes afirst housing, a second housing spaced from the first housing, and athird housing connecting the first housing to the second housing, wherea cutting area is formed between the first housing and the secondhousing. The first rotation wheel is at least partially disposed on thefirst housing. The second rotation wheel is at least partially disposedon the second housing. The motor is disposed in the housing assembly andis capable of driving one of the first rotation wheel and the secondrotation wheel to rotate. The hand-held band saw further includes: ansupporting device. The supporting device is connected to the firsthousing and is at least partially disposed in the cutting area. Thesupporting device includes: a fixing member, a slider, a supportingmember, a connection assembly and a buffer member. The fixing member isfixedly connected to the first housing. The slider is slidably connectedto the fixing member. The supporting member is connected to the slider.The connection assembly connects the slider and the supporting member.When the slider moves, the connection assembly is capable of enablingthe supporting member to move along with the slider. The buffer memberis mounted between the slider and the supporting member.

A hand-held band saw includes: a housing assembly, a first rotationwheel, a second rotation wheel, a motor. The housing assembly includes afirst housing, a second housing spaced from the first housing, and athird housing connecting the first housing to the second housing, wherea cutting area is formed between the first housing and the secondhousing. The first rotation wheel is at least partially disposed on thefirst housing. The second rotation wheel is at least partially disposedon the second housing. The motor is disposed in the housing assembly andis capable of driving one of the first rotation wheel and the secondrotation wheel to rotate. The hand-held band saw further includes: ansupporting device. The supporting device is connected to the firsthousing and is at least partially disposed in the cutting area. Thesupporting device includes: a fixing member, a slider, a supportingmember, a connection assembly and a buffer member. The fixing member isfixedly connected to the first housing. The slider is slidably connectedto the fixing member. The supporting member is connected to the slider.The connection assembly connects the slider and the supporting member.When where the slider moves, the connection assembly is capable ofenabling the supporting member to move along with the slider. Thecontrol assembly is mounted to the slider; and the control assembly isconnected to the fixing member and is configured to prevent the sliderfrom disengaging from the fixing member.

A hand-held band saw includes: a housing assembly, a first rotationwheel, a second rotation wheel, a motor. The housing assembly includes afirst housing, a second housing spaced from the first housing, and athird housing connecting the first housing to the second housing, wherea cutting area is formed between the first housing and the secondhousing. The first rotation wheel is at least partially disposed on thefirst housing. The second rotation wheel is at least partially disposedon the second housing. The motor is disposed in the housing assembly andis capable of driving one of the first rotation wheel and the secondrotation wheel to rotate. The hand-held band saw further includes: ansupporting device. The supporting device is connected to the firsthousing and is at least partially disposed in the cutting area. Thesupporting device includes: a fixing member, a slider, a supportingmember, a connection assembly and a buffer member. The fixing member isfixedly connected to the first housing. The slider is slidably connectedto the fixing member. The supporting member is connected to the slider,and is capable of being released and fixedly connected to the fixingmember. The buffer member is mounted between the slider and thesupporting member. The supporting member is capable of being driven tomove between a first position and a second position in a first slidingdirection, the supporting member is capable of being released and fixedat any one position between the first position and the second position,when the supporting member is fixed at any one position and moves to athird position under a force, the buffer member is capable of generatinga buffer force opposite to a moving direction, and the buffer force iscapable of enabling the supporting member to return to the any oneposition from the third position.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a three-dimensional structural view of a hand-held band saw ina second direction;

FIG. 2 is a three-dimensional structural view of the hand-held band sawas shown in FIG. 1 in a first direction;

FIG. 3 is a three-dimensional structural view of the hand-held band sawas shown in FIG. 1 from another perspective;

FIG. 4 is a three-dimensional structural view of a back of the hand-heldband saw as shown in FIG. 1;

FIG. 5 is a structural view illustrating that an supporting device ofthe hand-held band saw as shown in FIG. 1 is in a second position;

FIG. 6 is a front view of the hand-held band saw as shown in FIG. 1;

FIG. 7 is a structural view of a first guide mechanism and a secondguide mechanism of the hand-held band saw as shown in FIG. 1;

FIG. 8 is a structural view illustrating that an auxiliary handle of thehand-held band saw as shown in FIG. 1 is at an intermediate position ofthe handle;

FIG. 9 is a structural view illustrating that the auxiliary handle ofthe hand-held band saw as shown in FIG. 1 is in a first extremeposition;

FIG. 10 is a structural view illustrating that the auxiliary handle ofthe hand-held band saw as shown in FIG. 1 is in a second extremeposition;

FIG. 11 is a structural view illustrating that the supporting device ofthe hand-held band saw as shown in FIG. 1 is in a first position;

FIG. 12 is a sectional view taken along an A-A direction of FIG. 11;

FIG. 13 is a structural view illustrating that the supporting device ofthe hand-held band saw as shown in FIG. 1 is in an intermediateposition;

FIG. 14 is a structural view illustrating that the supporting device ofthe hand-held band saw as shown in FIG. 1 is in a second position;

FIG. 15 is a structural view illustrating that the supporting device ofthe hand-held band saw as shown in FIG. 1 is in a state of stresscollapse;

FIG. 16 is a partial enlarged view of FIG. 1;

FIG. 17 is a partial enlarged view of FIG. 2;

FIG. 18 is a partial enlarged view of FIG. 3;

FIG. 19 is a partial enlarged view of FIG. 4;

FIG. 20 is a partial enlarged view of FIG. 7;

FIG. 21 is a partial enlarged view of FIG. 7;

FIG. 22 is an exploded view of the auxiliary handle of the hand-heldband saw as shown in FIG. 1;

FIG. 23 is a structural view of an actuating device of the hand-heldband saw as shown in FIG. 20; and

FIG. 24 is a sectional view taken along a B-B direction of FIG. 21.

DETAILED DESCRIPTION

To clearly illustrate the technical solution of the present application,front and rear as shown in FIG. 1 are defined.

Referring to FIG. 1, an example of the present application provides anelectric tool, specifically, a hand-held band saw 100, which can bemounted with a saw blade 180 and drive the saw blade 180 to move so asto achieve the function of cutting a workpiece.

Referring to FIGS. 1 to 4, the hand-held band saw 100 of the presentapplication includes: a housing assembly 110, a first rotation wheel116, a second rotation wheel 117, a motor 200, a handle 120, a saw blade180 and a battery pack 135.

The housing assembly 110 forms an accommodation space for accommodatingvarious parts inside the hand-held band saw 100. The housing assembly110 includes a first housing 111, a second housing 112 and a thirdhousing 113. The first housing 111 is spaced from the second housing112, the third housing 113 connects the first housing 111 and the secondhousing 112, and the third housing 113, the first housing 111 and thesecond housing 112 are fixedly connected or integrally formed. A cuttingarea 114 is formed between the first housing 111 and the second housing112. The first housing 111 is formed with a first housing surface 1112,and the second housing 112 is formed with a second housing surface 1122.The handle 120 is connected to the housing assembly 110 and configuredfor the user to grip. Both ends of the handle 120 are fixedly connectedto the first housing surface 1112 and the third housing 113respectively. Of course, both ends of the handle 120 may also beintegrally formed with the first housing surface 1112 and the thirdhousing 113 respectively.

The motor 200 is configured to provide a power source to the hand-heldband saw 100 and is at least partially disposed within the housingassembly 110.

A first rotation wheel 116 and a second rotation wheel 117 are at leastpartially disposed within the accommodation space. The first rotationwheel 116 and the second rotation wheel 117 are disposed on a lower sideof the first housing surface 1112 and a lower side of the second housingsurface 1122 respectively. The handle 120 is located on an upper side ofthe first housing surface 1112, and the motor 200 is able to drive thefirst rotation wheel 116 and/or the second rotation wheel 117 to rotate.That is, the motor 200 drives the first rotation wheel 116 to rotate, orthe motor 200 may drive the second rotation wheel 117 to rotate, or ofcourse, the motor 200 may drive the first rotation wheel 116 and thesecond rotation wheel 117 to rotate. In this example, the first rotationwheel 116 is disposed in the first housing 111, the second transmissionwheel 117 is disposed in the second housing 112, and the motor 200drives the first rotation wheel 116 to rotate with respect to the firsthousing 111 about a first central axis 101. That is, the first rotationwheel 116 is configured to transmit power output by the motor 200 to thesaw blade 180.

The saw blade 180 is connected to the first rotation wheel 116 and thesecond rotation wheel 117. That is, when the first rotation wheel 116transmits the power output by the motor 200 to the saw blade 180, thesaw blade 180 drives the second rotation wheel 117 to rotate withrespect to the second housing 112 about the second central axis 102.

The battery pack 135 is mounted to the housing assembly 110 and isconfigured to provide an energy source to the hand-held band saw 100. Inthis example, the battery pack 135 is installed on the third housing.Specifically, the battery pack 135 has a connection port which iscooperated with a connection seat disposed on the third housing 113 toachieve the energy transmission.

The saw blade 180 connects the first rotation wheel 116 and the secondrotation wheel 117.

Referring to FIGS. 1, 11 to 15, the hand-held band saw 100 also includesan supporting device 140 connected to the housing assembly 110.Specifically, the supporting device 140 is connected to the firsthousing 111 and is at least partially disposed in the cutting area 114.The supporting device 140 includes a fixing member 141, a slider 142, asupporting member 143 and a connection assembly 144. The fixing member141 is fixedly connected to the first housing 111. In this example, thefixing member 141 is provided with multiple through holes 1411 throughwhich screws are fixed to the first housing 111. The slider 142 isslidably connected to the fixing member 141, that is, it can beunderstood that the slider 142 is capable of reciprocating with respectto the fixing member 141 in a first sliding direction a. The supportingmember 143 is configured to abut against the cut workpiece. Thesupporting member 143 is connected to the slider 142 through theconnection assembly 144, and the connection assembly 144 is fixedlyconnected to the slider 142, that is, it can be understood that when theslider 142 moves, the supporting member 143 is able to move with theslider 142 so that the supporting member 143 is in different positionsin the first sliding direction a, and a height of the supporting member143 is adjusted by the slider 142 to cooperate with differentworkpieces.

The supporting device 140 further includes a control assembly 145. Thecontrol assembly 145 is configured to drive the slider 142 to move thesupporting member 143 which, when moving in the first sliding directiona, is able to move to at least two positions. That is, the supportingmember 143 is able to move a first position and a second positionseparately, and is able to move between the first position and thesecond position. Of course, there may also be one or multipleintermediate positions between the first position and the secondposition according to different working conditions. Specifically, thecontrol assembly 145 drives the slider 142 to move the supporting member143 between the first position and the second position, or to keep thesupporting member 143 at the first position, the second position, or theintermediate position. The fixing member 141 is provided with multiplegrooves 1412. The control assembly 145 includes an operation member fora user to operate, the operation member is a control button 1451, astopper 1452 and an elastic member 1453. The elastic member 1453 isconnected to the control button 1451. In this example, the elasticmember 1453 may be a spring. The control button 1451 is configured to beoperated by the user. When the control button 1451 is in an originalstate and the stopper 1452 is cooperated with the groove 1412, thesupporting member 143 is relatively fixed at a certain position amongthe intermediate positions the first position, or the second position.The original state refers to a state of the control button 1451 when thespring is unstressed to be deformed. When the user presses the controlbutton 1451, the stopper 1452 is disengaged from the groove 1412, andthe slider 142 is able to move freely with respect to the fixing member141. When the control button 1451 loses the external force, the controlbutton 1451 is able to be restored to the original state under theaction of the elastic member 1453. Specifically, the control button 1451and the stopper 1452 are integrally formed and rotated about the rotaryaxis 103. In some examples, the control button 1451 may also be fixedlyconnected to the stopper 1452 and rotated about the rotary axis 103. Inthis example, in a case where the supporting member 143 is in the firstposition, on the premise that the stopper 1452 is clamped with thegroove 1412, the supporting member 143 is kept at a position closest tothe third housing 113 in the first sliding direction a. In a case wherethe supporting member 143 is in the second position, on the premise thatthe stopper 1452 is clamped with the groove 1412, the supporting member143 is kept at a position farthest from the third housing 113 in thefirst sliding direction a, in this case, the supporting member 143 isconfigured to cooperate with the workpiece having a large size. Theintermediate position refers to a position between the first positionand the second position and where the stopper 1452 is clamped with thegroove 1412 (as shown in FIG. 13). In this application, the intermediateposition is not forcibly defined between the first position and thesecond position, and the stopper 1452 may also be disengaged from thegroove 1412 when the supporting member 143 is at the intermediateposition. When the user presses the control button 1451, the user mayadjust the supporting member 143 to any one position of the intermediatepositions, the first position, or the second position. Therefore, theheight of the supporting member 143 may be adjusted by changing acorresponding relation between the control button 1451 and differentgrooves 1412 without the assistance of the external tool, which is moreconvenient and experiential.

Referring to FIG. 15, in a case where the supporting member 143 is inthe intermediate position and the hand-held band saw 100 is accidentallydropped, the supporting member 143 contacts the ground or other objects,the supporting member 143 is subjected to a relatively large externalforce, and the supporting member 143 moves in a direction facing towardthe third housing 113 in the first sliding direction a, that is, thesupporting member 143 moves from the intermediate position to a thirdposition, thereby avoiding the direct rigid collision between thesupporting member 143 and the ground or other objects, and furtheravoiding the drop damage of the hand-held band saw 100. When thesupporting member 143 is in the third position and the external forceapplied to the supporting member 143 disappears, the connection assembly144 is able to generate a buffer force opposite to a moving direction soas to move the supporting member 143 from the third position to theintermediate position, thereby avoiding that the user adjusts thesupporting member 143 again and improving the operation convenience. Thethird position is between the first position and the second position.The third position refers to the farthest position at which thesupporting member 143 can move from the intermediate position toward thethird housing 113 when a relatively large external force is applied.Since the magnitude of the external force applied each time isuncertain, the specific position of the third position is uncertain.

The connection assembly 144 includes a buffer member 1441 for resettingthe supporting member 143. The buffer member 1441 is disposed betweenthe slider 142 and the supporting member 143 and disposed in a directionparallel to the first sliding direction a. Specifically, the slider 142has an accommodation slot 1421 and a connection portion 1422. Theconnection portion 1422 is disposed on one side of the accommodationgroove 1421. The buffer member 1441 is at least partially disposed inthe accommodation groove 1421. One end of the buffer member 1441 isconnected to the connection portion 1422, and the other end of thebuffer member 1441 is connected to the supporting member 143. Since thebuffer member 1441 is provided, when the supporting member 143 falls orrigidly collides with the object and contracts, the supporting member143 may slide to a certain extent in a contraction direction, therebyachieving the purpose of preventing the supporting member from fallingand the control assembly 145 from falling and being damaged.

The connection assembly 144 also includes a guide rod 1442 disposed in afirst direction and fixedly connected to the slider 142 such that theguide rod 1442 can move along with the slider 142 when the slider 142moves. Specifically, a pin may be used to connect the slider 142 and oneend of the guide rod 1442. Of course, the guide rod 1442 and the slider142 are fixedly connected in other means. For example, external threadsare provided on one end of the guide rod 1442, internal threads areprovided in the connection portion 1422, and the guide rod 1442 and theconnection portion 1422 are threadedly connected. The other end of theguide rod 1442 is movably connected to the supporting member 143 forlimiting the supporting member 143 from being disengaged from the guiderod 1442 and moving freely. The supporting member 143 is provided with aprotrusion 1431. The protrusion 1431 extends in a directionperpendicular to the first sliding direction a, and the other end of theguide rod 1442 passes through the protrusion 1431 and cooperates withthe pin so that the protrusion 1431 cannot be disengaged from the guiderod 1442. In this application, the buffer member 1441 may specificallybe a spring sleeved on the guide rod 1442. One end of the spring abutsagainst the guide rod 1442 and the other end of the spring abuts againstthe protrusion 1431. The improved supporting device 140 has advantagesof simple structure, low production cost and convenient operation.

Referring to FIGS. 1 to 5, the hand-held band saw 100 also includes afirst guide mechanism 150 and a stop mechanism 170. The first guidemechanism 150 is configured to guide the saw blade 180 to move in afirst cutting direction b within the cutting area 114. The stopmechanism 170 is configured to prevent the saw blade 180 from passingover a predetermined position, avoiding that the saw blade 180 is unableto cut normally, and supporting the saw blade 180 so as to ensure thenormal operation of the machine.

The first guide mechanism 150 is connected to the housing assembly 110.The first guide mechanism 150 includes a first guide assembly 151 and asecond guide assembly. Specifically, the first guide assembly 151 ismounted to the first housing 111 and the second guide assembly 152 ismounted to the second housing 112. The first guide assembly 151 and thesecond guide assembly 152 are cooperated with each other so that the sawblade 180 is moved in the first cutting direction b within the cuttingarea 114.

When the hand-held band saw 100 works, that is, when the saw blade 180in the cutting area 114 moves in the first cutting direction b, the sawblade 180 moves from a first cutting position to a second cuttingposition, and the stop mechanism 170 stops the saw blade 180 frompassing over the second cutting position. The first cutting positionrefers to a position at which the saw blade 180 is mounted on the firstguide mechanism 150. The second cutting position refers to thepredetermined position, i.e., a position at which the saw blade 180 canmove on the first guide mechanism 150 under the action of the stopmechanism 170 and closest to the stop mechanism 170. In actual use, thefirst cutting position is not fixed. Of course, there is a case wherethe first cutting position coincides with the second cutting position,that is, an initial position of the saw blade 180 on the first guidemechanism 150 is the second cutting position at which the saw blade 180is located. The above design is used for preventing the saw blade 180from continuously shifting when moving so as to prevent the saw blade180 from passing over the second cutting position, ensure the normal useof the hand-held band saw 100, and avoid that the disengagement of thesaw blade 180 causes the equipment failure, affects the normal operationof the equipment, increases the cost of the subsequent repairment andmaintenance, and slows down the working efficiency.

Referring to FIGS. 16 and 17, the stop mechanism 170 includes a firststopper 171 and a second stopper 172. The first stopper 171 is connectedto the first housing 111 and is rotatable about a first rotary axis 104,and the second stopper 172 is connected to the second housing 112 and isrotatable about a second rotary axis 105 parallel to the first rotaryaxis 104. When the saw blade 180 is at the second cutting position, thatis, when the saw blade 180 is in contact with the first stopper 171 andthe saw blade 180 is also in contact with the second stopper 172, atleast part of the saw blade 180 at a position in contact with the firststopper 171 intersects a direction of the first rotary axis 104, and atleast part of the saw blade 180 at a position in contact with the secondstopper 172 intersects a direction of the second rotary axis 105, thatis, it can be understood that the saw blade 180 at the position wherethe first stopper 171 is in contact with the saw blade 180 intersectsthe direction of the first rotary axis 104, and the saw blade 180 at theposition where the second stopper 172 is in contact with the saw blade180 intersects the direction of the second rotary axis 105. Similarly,the saw blade 180 at the position where the first stopper 171 is incontact with the saw blade 180 is also perpendicular to the direction ofthe first rotary axis 104, and the saw blade 180 at the position wherethe second stopper 172 is in contact with the saw blade 180 isperpendicular to the second rotary axis 105. As an optional example, thesaw blade 180 includes a saw back 181, a saw edge (not shown in thefigure), a first side surface (not shown in the figure), and a secondside surface 182. The saw back 181 is disposed opposite to the saw edgefor cutting the workpiece, the first side surface is disposed oppositeto the second side surface 182, and the first side surface is at leastpartially in contact with the first guide mechanism 150. When the sawblade 180 is in the second cutting position, the saw back 181 is atleast partially in contact with the first stopper 171; in this case, thesecond side surface 182 at the position where the saw back 181 is incontact with the first stopper 171 is substantially parallel to a firstsurface 1711 of the first stopper 171, the saw back 181 is at leastpartially in contact with the second stopper 172, and the second sidesurface 182 at the position where the saw back 181 is in contact withthe second stopper 172 is also substantially parallel to a secondsurface 1721 of the second stopper 172. In this way, the machine can bebetter kept running stably. As another optional example, when the sawblade 180 is in the second cutting position, the saw back 181 is atleast partially in contact with the first stopper 171 and a planepassing through the first stopper 171 and perpendicular to the firstrotary axis 104 is substantially parallel to the second side surface 182at the position where the saw back 181 is in contact with the firststopper 171, the saw back 181 is in contact with the second stopper 172and a plane passing through the second stopper 172 and perpendicular tothe second rotary axis 105 is substantially parallel to the second sidesurface 182 at the position where the saw back 181 is in contact withthe second stopper 172.

The hand-held band saw 100 also includes a second guide mechanism 160configured to guide the saw blade 180 to move in a second cuttingdirection within the cutting area 114, and the second guide mechanism160 is connected to the housing assembly 110. Specifically, the secondguide mechanism 160 includes a third guide assembly 161 and a fourthguide assembly 162. The third guide assembly 161 is connected to thefirst housing 111, the fourth guide assembly 162 is connected to thesecond housing 112, and the third guide assembly 161 and the fourthguide assembly 162 cooperate with each other to enable the saw blade 180to move in the second cutting direction c within the cutting area 114. Aset of guide mechanisms is added, so that the user can adjust theassembly mode as needed in the actual operation, and the hand-held bandsaw 100 has different cutting paths. In a special case where theconventional hand-held band saw 100 cannot cut or is inconvenient tocut, the cutting path is changed to change the angle of the saw blade180 so as to ensure the cutting operation is performed smoothly.

The first rotation wheel 116 and the second rotation wheel 117 aredisposed substantially symmetrically with respect to a plane P2 passingthrough the cutting area 114. The first housing 111 and the secondhousing 112 are disposed substantially symmetrically with respect to theplane P2. The first guide assembly 151 and the second guide assembly 152are disposed substantially symmetrically with respect to the plane P2,the third guide assembly 161 and the fourth guide assembly 162 aredisposed substantially symmetrically with respect to the plane P2, andthe first stopper 171 and the second stopper 172 are disposedsubstantially symmetrically with respect to the plane P2.

Referring to FIGS. 6, 7, 20 and 21, the first guide assembly 151includes a first guide member 1511 and the second guide assembly 152includes a second guide member 1521. The first guide member 1511 rotatesabout a first rotation axis 106 and the first rotation axis 106intersects the first rotary axis 104. Since the first guide assembly 151and the second guide assembly 152 are disposed substantiallysymmetrically with respect to the plane P2, the second guide member 1521rotates in a direction parallel to the first rotation axis 106, and thefirst rotation axis 106 intersects the second rotary axis 105.Preferably, the first rotation axis 106 is perpendicular to the firstrotary axis 104 so as to facilitate the machining of the machine. Thethird guide assembly 161 includes a third guide member 1611 and a fourthguide member 1612. The third guide member 1611 rotates about a secondrotation axis 107, the fourth guide member 1612 is adjacent to the thirdguide member 1611, and the fourth guide member 1612 rotates about adirection substantially parallel to the second rotation axis 107. Thesaw blade 180 is disposed between the third guide member 1611 and thefourth guide member 1612. The fourth guide assembly 162 includes a fifthguide member 1621 and a sixth guide member 1622. The fifth guide member1621 and the third guide member 1611 are disposed substantiallysymmetrically with respect to the plane P2 and the fifth guide 1621 isrotatable in the direction substantially parallel to the second rotationaxis 107. The sixth guide member 1622 is disposed adjacent to the fifthguide member 1621, the sixth guide member 1622 and the fourth guidemember 1612 are disposed substantially symmetrical with respect to theplane P2, the sixth guide member 1622 is rotatable in the directionsubstantially parallel to the second rotation axis 107, and the sawblade 180 is disposed between the fifth guide member 1621 and the sixthguide member 1622. The first rotation axis 106 and the second rotationaxis 107 intersect and form a preset angle α. When cutting theworkpiece, the saw blade 180 is generally inclined to facilitate cuttingin a gravity direction or in a direction intersecting the gravitydirection, that is, the saw blade 180 moves in the second cuttingdirection c within the cutting area 114. The second rotation axis 107substantially coincides with the second cutting direction c. Inpractice, however, in order to facilitate cutting the workpieceintersecting or even perpendicular to the gravity direction, the sawblade 180 moves in the first cutting direction b within the cutting area114. The first rotation axis 106 substantially coincides with the firstcutting direction b. The first rotation axis 106 and the second rotationaxis 107 intersect and form a preset angle α which is less than or equalto 90 degrees. In this example, the preset angle a ranges from 20degrees to 55 degrees, preferably, from 30 degrees to 45 degrees.

The first guide mechanism 150 and the second guide mechanism 160 areconnected to an intermediate connection assembly 190 which is fixedlyconnected to the housing assembly 110. Specifically, the intermediateconnection assembly 190 includes a first intermediate connection portion191 and a second intermediate connection portion 192. The first guideassembly 151 and the second guide assembly 152 are mounted to the firstintermediate connection portion 191 and the second intermediateconnection portion 192 respectively. The first intermediate connectionportion 191 and the second intermediate connection portion 192 aremounted to the first housing 111 and the second housing 112respectively. The third guide assembly 161 and the fourth guide assembly162 are mounted to the first intermediate connection portion 191 and thesecond intermediate connection portion 192 respectively. Morespecifically, the first intermediate connection portion 191 may befastened to the first housing 111 with screws, and the secondintermediate connection portion 192 may also be fastened to the secondhousing 112 with the screws. The stop mechanism 170 is connected to theintermediate connection assembly 190, and the first stopper 171 and thesecond stopper 172 are connected to the first intermediate connectionportion 191 and the second intermediate connection portion 192respectively.

As another optional example, as shown in FIG. 8, the first housing 111includes a first extension portion 1111, the second housing 112 includesa second extension portion 1121. The first stopper 171 and the secondstopper 172 are connected to the first extension portion 1111 and thesecond extension portion 1121 respectively, and the first guidemechanism 150 and the second guide structure 160 are connected to theintermediate connection assembly 190. Specifically, the first guideassembly 151 and the second guide assembly 152 are mounted to the firstintermediate connection portion 191 and the second intermediateconnection portion 192 respectively. The third guide assembly 161 andthe fourth guide assembly 162 are mounted to the first intermediateconnection portion 191 and the second intermediate connection portion192 respectively.

Specifically, the first guide member 1511, the second guide member 1521,the third guide member 1611, the fourth guide member 1612, the fifthguide member 1621, the sixth guide member 1622, the first stopper 171and the second stopper 172 are all rolling bearings. The first guidemember 1511, the third guide member 1611 and the fourth guide member1612 are fitted to the first intermediate connection portion 191 by thescrews, and the second guide member 1521, the fifth guide member 1621and the sixth guide member 1622 are fitted to the second intermediateconnection portion 192 by the screws.

Referring to FIGS. 1 to 6, the hand-held band saw 100 also includes anauxiliary handle 130 for the user to grip. The auxiliary handle 130 isrotationally connected to the housing assembly 110. In this example, theauxiliary handle 130 is rotationally connected to the second housing112, and of course, the auxiliary handle 130 may also be rotationallyconnected to the third housing 113. Specifically, the auxiliary handle130 includes a first gripping portion 131, a second gripping portion 132spaced from the first gripping portion 131, a third gripping portion133, an auxiliary gripping portion 134, a coupling portion 136 and anextension portion 137. The third gripping portion 133 connects one endof the first gripping portion 131 and one end of the second grippingportion 132, the coupling portion 136 connects the other end of thefirst gripping portion 131 and the other end of the second grippingportion 132, the extension portion 137 is connected to one end, adjacentto the coupling portion 136, of the first gripping portion 131, theauxiliary gripping portion 134 is connected to the extension portion137, and the auxiliary gripping portion 134 is located on an upper sideof the second housing surface 1122. According to the above arrangement,when the hand-held band saw 100 is operated, the user can place the palmof the hand gripping the auxiliary handle 130 on the auxiliary grippingportion 134. Such way can not only maintain the stability of the body ofthe hand-held band saw 100 and prevent the case of the uneven cutting ofthe workpiece caused by the body waging from side to side, but alsoplace the hand originally placed on the auxiliary handle on theauxiliary gripping portion, and release the gripping hand, so that theoperation is much easier and labor-saving.

The auxiliary gripping portion 134 is fixedly connected or integrallyformed with the extension portion 137, that is, the auxiliary grippingportion 134 is rotatable with respect to the housing assembly 110. Inthe specific operation, the user holds the handle 120 with one hand andlaps the other hand on the auxiliary gripping portion 134, and the handon the handle 120 controls an actuating device 220 to start thehand-held band saw 100 for the cutting work. According to the actualoperation position of the cut workpiece, the user can adjust theoperation in real time. The auxiliary gripping portion 134 is added onthe structure of the auxiliary handle 130, so that the user can removethe arm that originally applied a force to the auxiliary handle 130 whencutting the workpiece, and thus avoiding the case where the arm blocksthe sight, in particular, the case where the workpiece to be cut is in arelatively low position, the user needs to bend over to operate, andthus the arm of the hand gripping the auxiliary handle 130 can easilyblock the visual field of the user, thereby affecting the cuttingaccuracy of the user.

The handle 120 is disposed symmetrically with respect to the plane P1,and extension directions of the first gripping portion 131 and thesecond gripping portion 132 are both substantially parallel to the planeP1. An angle intersected by the plane P1 and the first housing surface1112 ranges from 135 degrees to 155 degrees, preferably, from 140degrees to 150 degrees. The plane P1 of the handle is substantiallyparallel to the second cutting direction c, that is, when the useroperates the hand-held band saw 100 to cut the workpiece in the secondcutting direction c, an extension direction of the handle 120 isconsistent with the gravity direction of the machine at this time,thereby increasing the user's sense of experience and enabling thehand-held band saw 100 to be operated smoothly and cut normally.

The handle 120 includes a handle operation portion 126 for the user tooperate the hand-held band saw 100. The hand-held band saw 100 has apreset plane P3, the first housing surface 1112 and the second housingsurface 1122 are at least partially located in a preset plane P3, and adistance D1 from the handle 120 to the preset plane P3 in a directionperpendicular to the preset plane P3 is greater than a distance D2 fromthe auxiliary gripping portion 134 to the preset plane P3 in thedirection perpendicular to the preset plane P3. The auxiliary grippingportion 134 is disposed on an upper side of the preset plane P3 and on alower side of the handle operation portion 126. When the user grips thehandle operation portion 126 with one hand, the other hand previouslygripped the auxiliary handle 130 now can grip the auxiliary grippingportion 134 which is lower than the handle operation portion 126. Inthis case, when the user grips the hand-held band saw 100, the height ofthe machine can be lowered, the gravitational potential energy of themachine in the gravity direction can be lowered, and the user is in arelatively labor-saving state.

The user gripping the auxiliary gripping portion 134 also gives anauxiliary force to the body of the hand-held band saw 100 from a sidedirection, which is much easier and labor-saving for the user inoperation, and does not need to lift or lower the body. The user maychoose to hold a gripping top surface 1345 of the auxiliary grippingportion 134 to maintain the stability of the body; and may also lift themachine body from a gap between the auxiliary gripping portion 134 andthe second housing surface 1122 to maintain the stability of the machinebody and complete the machining operation. Based on the design of thestructure of the auxiliary gripping portion 134, the original forceapplied vertically is changed into an auxiliary supporting force fromthe side, which is more conducive to maintaining the stability of thebody of the hand-held band saw 100 during the cutting and preventing thecase of the uneven cutting of the workpiece caused by the vibration ofthe machine during the cutting.

Referring to FIGS. 6, 9, 10, 18 and 19, the auxiliary gripping portion134 includes a first gripping side 1341, a second gripping side 1342 anda gripping bottom surface 1346. The first gripping side 1341 is disposedadjacent to the second gripping side 1342, and an extension portion 137of the auxiliary handle 130 has one extension end which is fixedlyconnected or integrally formed with a part of the first gripping side1341 adjacent to the second gripping side 1342, which is conductive tomachining. The second housing surface 1122 has a central surface 1123extending within a preset plane P3. The auxiliary handle 130 isrotatable about the rotation axis 108, a first extreme position and asecond extreme position exist during the rotation of the auxiliaryhandle 130. The first extreme position is a position at which theauxiliary handle 130 is in contact with the second housing 112 (as shownin FIG. 9). The second extreme position is a position at which theauxiliary handle 130 is in contact with the battery pack 135 (as shownin FIG. 10), and at least one intermediate position of the handle (asshown in FIG. 6) exists between the first extreme position and thesecond extreme position such that the gripping bottom surface 1346 issubstantially parallel to the central surface 1123 of the second housingsurface 1122. As another example, the gripping bottom surface 1346 ofthe auxiliary gripping portion 134 is partially within a gripping planeP4. It can also be understood that the gripping bottom surface 1346 isnot a plane and may be in other shapes. The gripping bottom surface 1346is partially within the gripping plane P4, that is, the gripping planeP4 rotates along with the auxiliary gripping portion 134, and the firstextreme position and the second extreme position also exist in thegripping plane P4 during the rotation. An intermediate position of thehandle exists between the first extreme position and the second extremeposition, so that the gripping plane P4 is substantially parallel to thecentral surface 1123 of the second housing surface 1122.

The hand-held band saw 100 further includes a tension assembly 115 foradjusting a position of the saw blade 180 so as to maintain a reasonabletension during the operation of the saw blade 180 and ensure the normaloperation of the machine. The tension assembly 115 includes a switchknob 1151 which is rotationally connected to the second housing 112 andis disposed between the second housing surface 1122 and the auxiliarygripping portion 134 so as to prevent the switch knob 1151 fromcontacting the auxiliary gripping portion 134 during the rotation. Morespecifically, the switch knob 1151 has a top surface 1152. When theauxiliary handle 130 is at the intermediate position of the handle, aminimum distance from the gripping bottom surface 1346 of the auxiliarygripping portion 134 to the second housing surface 1122 in the directionperpendicular to the preset plane P3 is greater than a maximum distancefrom a top surface 1152 of the switch knob 1151 to the second housingsurface 1122 in the direction perpendicular to the preset plane P3,which is convenient for the user to grip the auxiliary gripping portion134 to keep the body stable, and can also leave a sufficient gap for theuser to lift the auxiliary gripping portion 134 and the switch knob 1151to complete the cutting operation.

When the auxiliary handle 130 is at the intermediate position of thehandle, a length H from the gripping bottom surface 1346 to the centralsurface 1123 in the direction perpendicular to the preset plane P3ranges from 28 mm to 70 mm during which the hand of the user does nottouch the switch knob 1151, so that when the auxiliary gripping portion134 is gripped, the switch knob 1151 cannot be unusable, therebyimproving the user experience.

Referring to FIGS. 2, 6, 18 and 19, the auxiliary gripping portion 134also includes a third gripping side 1343 disposed opposite to the firstgripping side 1341, a fourth gripping side 1344 disposed opposite to thesecond gripping side 1342, and a gripping top surface 1345 connected tothe first gripping side 1341, the second gripping side 1342, the thirdgripping side 1343, and the fourth gripping side 1344, and the grippingtop surface 1345 is disposed opposite to the gripping bottom surface1346. The extension end is at least partially connected to the grippingtop surface 1345. When the auxiliary handle 130 is at the intermediateposition of the handle, the first gripping side 1341, the secondgripping side 1342, the third gripping side 1343 and the fourth grippingside 1344 are substantially perpendicular to the preset plane P3, andthe gripping top surface 1345 is approximately arc-shaped, so that whenthe hand-held band saw 100 is used by the user, it can be well fitted tothe palm of the user, improving the user experience. Of course, we canunderstand that the gripping top surface 1345 and the gripping bottomsurface 1346 of the auxiliary gripping portion 134 are both planar. Asanother example, the gripping top surface 1345 and the gripping bottomsurface 1346 may not be planar. For example, the gripping bottom surface1346 is configured to be concave to facilitate the user's grip, and thegripping top surface 1345 is convex to facilitate placing the user'spalm. With the above design, the auxiliary gripping portion 134 may be ahexahedron, which facilitates the machining. In this example, theauxiliary gripping portion 134 is a hexahedron, and of course, theauxiliary gripping portion 134 may be in other shapes.

Joints of the four gripping sides are arc angles, which can improve thecomfort of user when gripping. A rubber anti-slip layer is arranged onthe gripping top surface 1345 of the auxiliary gripping portion 134, andthe arrangement of the rubber anti-slip layer is more beneficial toimproving the operation feeling of the user in the cutting operation.When the rubber layer is not provided on the user's operating glove, therubber anti-slip layer on the gripping top surface 1345 can effectivelyprevent the user's hand from slipping off

Referring to FIGS. 1 to 4, the hand-held band saw further includes theactuating device 220 for driving the motor 200, and the actuating device220 is disposed adjacent to the handle operation portion 126.Specifically, referring to FIGS. 22 to 24, the actuating device 220includes a switch assembly 221, a first pressing member 222 and a secondpressing member 223. The switch assembly 221 is coupled to the motor 200and the switch assembly 221 is configured to control whether the motor200 is actuated or not. The first pressing member 222 is configured tocontrol the switch assembly 221 and the second pressing member 223 isconfigured to control the switch assembly 221. That is to say, the firstpressing member 222 and the second pressing member 223 may control theswitch assembly 223 separately, thereby actuating the motor 200.

The first pressing member 222 is movably connected to the handle 120.The first pressing member 222 during the movement has at least a firstactuating position for actuating the motor 200 and a first stoppingposition for stopping the motor 200. The second pressing member 223 ismovably connected to the handle 120. The second pressing member 223during the movement has at least a second actuating position foractuating the motor 200 and a second stopping position for stopping themotor 200. That is, the motor 200 may be actuated by any one of thefirst pressing member 222 or the second pressing member 223, and ofcourse, the motor 200 may be actuated by simultaneously operating thefirst pressing member 222 and the second pressing member 223. To explainhere, the first actuating position and the first stopping position arepositions where the first pressing member 222 drives the switch assembly221 to start and stop the motor 200 respectively. Similarly, the secondactuating position and the second stopping position are positions wherethe second pressing member 223 drives the switch assembly 221 to startand stop the motor 200 respectively. The positions where the motor 200is started or stopped each time may not be fixed as long as the functionof actuating or stopping the motor 200 can be achieved. The firstpressing member 222 and the second pressing member 223 may be driven ina contact mode or in a non-contact mode. When the hand-held band saw 100is used by the user, the user may operate the first pressing member 222and/or the second pressing member 223 with one hand, therebyfacilitating the user's operation.

Referring to FIGS. 22 to 24, the handle 120 has an accommodation cavity121 formed by a left half housing 122 and a right half housing 123. Theswitch assembly 221 is disposed in the accommodation cavity 121, thefirst pressing member 222 is at least partially disposed in theaccommodation cavity 121, the first pressing member 222 is connected tothe handle 120, the first pressing member 222 is rotated about a firstaxis 124 with respect to the handle 120. Specifically, one end of thefirst pressing member 222 is mounted on the left half housing 122 andthe other end of the first pressing member 222 is freely movable.Moreover, the second pressing member 223 is also at least partiallydisposed in the accommodation cavity 121, and is connected to the handle120. The second pressing member 223 is rotated about a second axis 125with respect to the handle 120. Specifically, one end of the secondpressing member 223 is mounted on the left half housing 122, and theother end of the second pressing member 223 is freely movable. Whetherthe first pressing member 222 and the second pressing member 223 arespecifically connected to the right half housing 123 or the left halfhousing 122 is not limited in the present application. It is to be notedthat the position connected to one end of the first pressing member 222is referred to as a first connection point 2221, and the positionconnected to one end of the second pressing member 223 is referred to asa second connection point 2231.

The first pressing member 222 rotates from the first stopping positionto the first actuating position, and drives the second pressing member223 from the second stopping position to the second actuating position.Specifically, the user drives the first pressing member 222, so that thefirst pressing member 222 drives the second pressing member 223 toapproach the switch assembly 221, so that the second pressing member 223is at the second actuating position, thereby actuating the machine. Asan optional manner, when the user drives the second pressing member 223,the second pressing member 223 approaches the switch assembly 221 sothat the second pressing member 223 is at the second actuating position,in this case, the first pressing member 222 is still at the firststopping position. As other optional manners, the second pressing member223 rotates from the second stopping position to the second actuatingposition, drives the first pressing member 222 to move from the firststopping position to the first actuating position. Specifically, theuser operates the second pressing member 223, so that the secondpressing member 223 approaches to the switch assembly 221, and drivesthe first pressing member 222 to move from the first stopping positionto the first actuating position. In this way, the motor 200 can beactuated by the user regardless of operating the first pressing member222 or the second pressing member 223. The first pressing member 222 andthe second pressing member 223 are provided, so that the user can selectan appropriate operation position in real time according to the positionof the workpiece to be cut, especially when the workpiece to be cut isat a relatively difficult position to operate, the two pressing membersgive the user more choices and greatly improve the operation handfeeling of the user.

Referring to FIGS. 4 and 21, a longest distance from the first pressingmember 222 to the first axis 124 is substantially equal to a longestdistance from the second pressing member 223 to the second axis 125, andthe first axis 124 is substantially parallel to the second axis 125.Specifically, the first axis 124 and the second axis 125 aresubstantially perpendicular to the plane P1. A projection distance fromthe first pressing member 222 to the first connection point 2221 on theplane P1 is substantially equal to a projection distance from the secondpressing member 223 to the second connection point 2231 on the plane P1,and the first pressing member 222 and the second pressing member 223when pressed have the substantially same torque. The first axis 124 andthe second axis 125 are perpendicular to the handle plane P1 separately.

The hand-held band saw 100 further includes a second elastic member. Oneend of the second elastic member is fixedly connected to the handle 120and the other end of the second elastic member is connected to the firstpressing member 222. The second elastic member is disposed in theaccommodation cavity 121. Specifically, one end of the second elasticmember is fixedly connected to the handle 120. Whether one end of thesecond elastic member is arranged on the left half housing 122 or theright half housing 123 is not limited herein. In this example, one endof the second elastic member is fixedly connected to the left halfhousing 122. The other end of the second elastic member is connected tothe first pressing member 222. The second elastic member mayspecifically be a spring. When the user presses the second pressingmember 223, the first pressing member 222 moves together with the secondpressing member 223 under the action of a pre-tightening force of thespring. When the user removes the pressing force on the second pressingmember 223, the second pressing member 223 returns to the secondstopping position under the action of the switch assembly 221. In thisway, the second pressing member 223 drives the first pressing member 222to return to the first stopping position. The above design is simple instructure and easy to be achieved.

Referring to FIG. 24, the first pressing member 222 has a protrusion2222, and the second pressing member 223 has a groove 2232. Theprotrusion 2222 cooperates with the groove 2232 so that the secondpressing member 223 pushes the first pressing member 222 to rotate.Specifically, the user presses the first pressing member 222, theprotrusion 2222 approaches the groove 2232 and pushes the secondpressing member 223 closer to the switch assembly 221, thereby actuatingthe motor 200. When the user removes the pressing force on the firstpressing member 222, the second pressing member 223 returns to thesecond stopping position under the action of the switch assembly 221,and the groove 2232 of the second pressing member 223 pushes theprotrusion 2222 so as to make the first pressing member 222 return tothe first stopping position.

A distance between the protrusion 2222 of the first pressing member 222and the first axis 124 in a direction perpendicular to the first axis124 is substantially equal to a distance between the groove 2232 of thesecond pressing member 223 and the second axis 125 in a directionperpendicular to the second axis 125. That is, a projection distancefrom the protrusion 2222 to the first axis 124 on the plane P1 issubstantially equal to a projection distance from the groove 2232 to thesecond axis 125 on the plane P1. The above design has an advantage thata counterforce of the switch assembly 221 to the first pressing member222 or the second pressing member 223 is substantially the same.

The first pressing member 222 has a first pressing surface 2223, and thesecond pressing member 223 has a second pressing surface 2233. The firstpressing surface 2223 is substantially arc-shaped, the second pressingsurface 2233 is substantially arc-shaped, and the first pressing surface2223 is adjacent to the second pressing surface 2233. Specifically, theuser presses the first pressing surface 2223 or the second pressingsurface 2233 to drive the first pressing member 222 or the secondpressing member 223. That is, the first pressing member 222 isoverlapped with the second pressing member 223, the protrusion 2222 ofthe first pressing member 222 and the groove 2232 of the second pressingmember 223 are an overlap of the first pressing member 222 and thesecond pressing member 223. A projection distance from the protrusion2222 to the first connection point 2221 on the plane P1 is less than aprojection distance from the first pressing member 222 to the firstconnection point 2221 on the plane P1. Similarly, a projection distancefrom the groove 2232 to the second connection point 2231 on the plane P1is less than a projection distance from the second pressing member 223to the second connection point 2231 on the plane P1. It can beunderstood that when the force is applied to the second pressing surface2233, the force is extended and applied to the second pressing member223, so that the second pressing member 223 rotates about the secondaxis 125. When the counterforce of the switch assembly 221 to the secondpressing member 223 is applied to the second pressing surface 2233, adistance between the second axis 125 and the second pressing surface2233 is greater than a distance between the groove 2232 and the secondaxis 125, that is, a force arm of the second pressing member 223 isgreater than a force arm of the counterforce force, so that the forcearm of the user acting on the second pressing member 223 is prolongedand the pressing is more labor-saving. Similarly, the first pressingmember 222 also has the same principle, which is not repeated herein.

The first pressing surface 2223 and the second pressing surface 2233 aresubstantially continuous. That is, the first pressing surface 2223 andthe second pressing surface 2233 are basically arc-shaped. The user cannot only activate the motor 200 by pressing either the first pressingsurface 2223 or the second pressing surface 2233, but also press theoverlap of the first pressing surface 2223 and the second pressingsurface 2233 to actuate the motor 200. With the above arrangement, thepressing area of the actuating device 220 is increased, so that the usercan select an appropriate gripping angle according to the user's owngripping habit, thereby improving the use safety of the hand-held bandsaw 100 while facilitating the user's operation.

The switch assembly 221 includes an actuating element 2211 for touchingthe motor 200. The actuating element 2211 has a triggering portion 2212which cooperates with the second pressing member 223. The secondpressing member 223 has triggering surface 2234. When the secondpressing member 223 moves from the second stopping position to thesecond actuating position, the triggering surface 2234 cooperates withthe triggering portion 2212 so that the actuating element 2211 triggersthe motor 200 to actuate, and the triggering portion 2212 is disposedadjacent to the triggering surface 2234. Specifically, the user pressesany one of the first pressing member 222 and the second pressing member223, so that the triggering surface 2234 pushes the triggering portion2212 to actuate the motor 200. When the user withdraws the externalforce, the actuating element 2211 is restored, that is, the triggeringportion 2212 pushes the triggering surface 2234 to make the secondpressing member 223 return to the second stopping position.

As other optional examples, the actuating device 220 may also bearranged on power tool products such as an electric circular saw, areciprocating saw, a multi-functional tool, an electric drill, anelectric router and the like. The specific structure is not describedhere in detail.

The above are just preferred examples of the present application and thescope of the present application is not limited by the above examples.However, any equivalent modifications or changes made by those skilledin the art according to the contents disclosed in the presentapplication should be within the scope described by the claims.

What is claimed is:
 1. A hand-held band saw, comprising: a firstrotation wheel; a second rotation wheel; a housing assembly comprising afirst housing for supporting the first rotation wheel, a second housingfor supporting the second rotation wheel and spaced from the firsthousing, and a third housing connecting the first housing to the secondhousing, wherein a cutting area is formed between the first housing andthe second housing; a motor disposed in the housing assembly and capableof driving at least one of the first rotation wheel or the secondrotation wheel to rotate; and a supporting device, configured to supporta workpiece, connected to the first housing and at least partiallydisposed in the cutting area; wherein the supporting device comprises: afixing member fixedly connected to the first housing; a slider slidablyconnected to the fixing member; a supporting member for supporting theworkpiece and connected to the slider; and a connection assemblyconnecting the slider and the supporting member, wherein, when theslider moves, the connection assembly is capable of enabling thesupporting member to move along with the slider; and wherein theconnection assembly comprises a buffer member mounted between the sliderand the supporting member.
 2. The hand-held band saw of claim 1, whereinthe supporting device further comprises a control assembly mounted tothe slider and the control assembly is connected to the fixing memberand configured to prevent the slider from disengaging from the fixingmember.
 3. The hand-held band saw of claim 2, wherein a whole of thesupporting member and the slider is capable of moving between a firstposition and a second position with respect to the fixing member in afirst sliding direction, at least one intermediate position existsbetween the first position and the second position, and the whole of thesupporting member and the slider is capable of being kept at the atleast one intermediate position.
 4. The hand-held band saw of claim 3,wherein the control assembly comprises a stopper capable of cooperatingwith the fixing member, the slider is configured to be fixed withrespect to the fixing member when the stopper is in contact with thefixing member, and the slider is capable of moving with respect to thefixing member when the stopper is disengaged from the fixing member. 5.The hand-held band saw of claim 4, wherein the fixing member is providedwith a plurality of grooves, the stopper is capable of meshing with theplurality of grooves, and, in a case where the slider is in the firstposition, the second position, or the at least one intermediate positionand the stopper is meshing with the plurality of grooves, the slider isfixed with respect to the fixing member.
 6. The hand-held band saw ofclaim 3, wherein, when the supporting member is forced to move to athird position relative to the sliding member at the intermediateposition, the first position, or the second position, the buffer memberis capable of generating a buffer force and the buffer force is capableto enabling the supporting member to have a tendency to move from thethird position to the intermediate position, the first position, or thesecond position.
 7. The hand-held band saw of claim 3, wherein theconnection assembly comprises a guide rod disposed along the firstsliding direction and connected to the slider and the buffer member issleeved on the guide rod.
 8. The hand-held band saw of claim 7, whereinthe buffer member is a spring.
 9. The hand-held band saw of claim 7,wherein the supporting member is provided with a protrusion extending ina direction perpendicular to the first sliding direction, one end of theguide rod is connected to the slider, and another end of the guide rodis connected to the protrusion.
 10. The hand-held band saw of claim 4,wherein the control assembly further comprises a control button for auser to operate to drive the stopper to disengage with the fixing memberand an elastic member configured to reset the control button.
 11. Thehand-held band saw of claim 10, wherein the control button is integrallyformed with the stopper.
 12. A band saw, comprising: a first rotationwheel; a second rotation wheel; a housing assembly comprising a firsthousing for supporting the first rotation wheel, a second housing forsupporting the second rotation wheel and spaced from the first housing,and a third housing connecting the first housing to the second housing,wherein a cutting area is formed between the first housing and thesecond housing; a motor disposed in the housing assembly and capable ofdriving at least one of the first rotation wheel or the second rotationwheel to rotate; and a supporting device, configured to support aworkpiece, connected to the first housing; wherein the supporting devicecomprises: a fixing member fixedly connected to the first housing; aslider slidably connected to the fixing member; a supporting member forsupporting the workpiece and connected to the slider; and a connectionassembly connecting the slider and the supporting member; wherein theconnection assembly is capable of enabling the supporting member to movewith the slider when the slider moves and the connection assembly isfurther configured to allow the supporting member to move relative tothe slider.
 13. The band saw of claim 12, wherein a whole of thesupporting member and the slider is capable of moving between a firstposition and a second position with respect to the fixing member in afirst sliding direction, at least one intermediate position existsbetween the first position and the second position, and the whole of thesupporting member and the slider is capable of being kept at the atleast one intermediate position.
 14. The band saw of claim 13, whereinthe fixing member is provided with a plurality of grooves, thesupporting device further comprises a stopper capable of meshing withthe plurality of grooves, and, in a case where the slider is in thefirst position, the second position, or the at least one intermediateposition and the stopper is meshing with the plurality of grooves, theslider is fixed with respect to the fixing member.
 15. The band saw ofclaim 14, wherein the supporting device further comprises an operationmember for a user to operate to drive the stopper to disengage with theplurality of grooves.
 16. The band saw of claim 14, wherein theoperation member is further configured to drive the slider to move andthe operation member is mounted to the slider.
 17. The band saw of claim12, wherein the connection assembly comprises a buffer member connectingthe slider and the supporting member and configured to bias thesupporting member.
 18. The band saw of claim 17, wherein the buffermember is a spring.
 19. The band saw of claim 18, wherein, when thesupporting member moves relative to the slider under a force, the buffermember is capable of generating a buffer force opposite to a movingdirection of the supporting member.
 20. The band saw of claim 18,wherein the connection assembly comprises a guide rod connecting withthe slider and supporting member and the spring is sleeved on the guiderod.